test: don't use package main for files without a main function
Part of issue 2833, but works fine with current test runner.
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5606056
diff --git a/test/fixedbugs/bug063.go b/test/fixedbugs/bug063.go
index 543e0b7..15ca44c 100644
--- a/test/fixedbugs/bug063.go
+++ b/test/fixedbugs/bug063.go
@@ -4,5 +4,5 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
-package main
+package bug063
const c = 0 ^ 0
